Is dance therapy this another one of those holistic fad treatments?

Not a fad. Dance/movement therapy is well-established as a psychotherapeutic intervention. It's one of the "expressive" therapies such as art therapy and music therapy, etc. Having trained therapists, it uses dance and movement to promote emotional, social, cognitive and physical integration of the individual. For more information, see the american dance therapy association at: http://www.Adta.Org/.